Draft Recovery Plan for the Western Snowy Plover, Pacific Coast
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Western Snowy Plover (Charadrius alexandrinus nivosus) Pacific Coast Population Draft Recovery Plan (May 2001) U.S. Fish and Wildlife Service Region 1 Approved: XXXXXXXXXXXXXXXXXXXXXXXXXXXXX Manager, California/Nevada Operations Office Region 1, U.S. Fish and Wildlife Service Date: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX PRIMARY AUTHORS Ruth Pratt of the Sacramento Fish and Wildlife Office, U.S. Fish and Wildlife Service, Sacramento, California, acted as the Recovery Team Manager and coordinated preparation of the recovery plan. Recovery plan preparation was supervised and edited by Karen Miller, Diane Elam, and Ina Pisani, Sacramento Fish and Wildlife Office. We gratefully acknowledge the efforts of the Pacific Coast Western Snowy Plover Recovery Team in preparing this recovery plan. Special acknowledgment is also given to Nadav Nur, Point Reyes Bird Observatory, Stinson Beach, California, for his work on the population viability analysis. i DISCLAIMER Recovery plans delineate reasonable actions that are believed to be required to recover and/or protect listed species. We, the Fish and Wildlife Service, publish recovery plans, sometimes preparing them with the assistance of recovery teams, contractors, State agencies, and others. Recovery teams serve as independent advisors to the Fish and Wildlife Service. Objectives of the plan will be attained and necessary funds made available subject to budgetary and other constraints affecting the parties involved, as well as the need to address other priorities. Recovery plans do not obligate cooperating or other parties to undertake specific tasks, and may not represent the views nor the official positions or approval of any individuals or agencies involved in the plan formulation, other than our own. They represent our official position only after they have been signed by the Director, Regional Director, or Operations Manager as approved. Approved recovery plans are subject to modification as dictated by new findings, changes in species status, and the completion of recovery tasks. Literature Citation Should Read As Follows: U.S. Fish and Wildlife Service. 2001. Western Snowy Plover (Charadrius alexandrinus nivosus) Pacific Coast Population Draft Recovery Plan. Portland, Oregon. xix + 630 pp. ii ACKNOWLEDGMENTS The following U.S. Fish and Wildlife Service staff provided valuable review and comments on the recovery plan: John Grettenberger, Western Washington Office, Lacey, Washington; Carrie Phillips, Newport Fish and Wildlife Office, Newport, Oregon; Jim Watkins, Arcata Fish and Wildlife Office, Arcata, California; Robert Mesta, Bureau of Land Management Region 2 Office, Tucson, Arizona; and Doreen Stadtlander, Carlsbad Fish and Wildlife Office, Carlsbad, California. Maps of snowy plover sites in Appendix L were prepared by Scott Phillips of the Endangered Species Recovery Program, Fresno, California. The cover illustrations for the front cover and Appendix K are used courtesy of Carleton R. Eyster, Santa Cruz, California. iii PACIFIC COAST WESTERN SNOWY PLOVER RECOVERY TEAM Sarah Allen Sean Morton National Park Service County of Santa Barbara Point Reyes, California Santa Barbara, California Tim Burr Martin Nugent U.S. Department of the Navy Oregon Department of Fish and Wildlife San Diego, California Portland, Oregon Jeff Chastain Gary Page C & M Stables Point Reyes Bird Observatory Florence, Oregon Stinson Beach, California Janet Didion Kerrie Palermo California Dept. of Parks and Recreation U.S. Forest Service Sacramento, California Reedsport, Oregon David Dixon Daniel Pearson California Dept. of Parks and Recreation Southern California Edison Monterey, California Rosemead, California Erin Fernandez John Phillips San Francisco Bay National Wildlife Refuge Oregon Parks and Recreation Dept. Newark, California Coos Bay, Oregon Richard Griffiths Abby Powell U.S. Marine Corps U.S.G.S., Biological Resources Division Camp Pendleton, California Fayetteville, Arkansas Jim Heaney Jim Raives U.S. Bureau of Land Management California Coastal Commission North Bend, Oregon San Francisco, California William Hornbrook Nancy Read Fish Phone U.S. Department of the Air Force Eureka, California Vandenberg Air Force Base, California Tim Jensen Chris Regan Monterey Peninsula Regional Park District Washington State Parks and Recreation Carmel Valley, California Olympia, Washington Ron Jurek Scott Richardson California Department of Fish and Game Washington Department of Fish and Wildlife Sacramento, California Olympia, Washington Don Klusman Mark Stern California Assoc. of 4 Wheel Drive Clubs, Inc. Oregon Natural Heritage Program Yuba City, California Portland, Oregon iv EXECUTIVE SUMMARY CURRENT SPECIES STATUS: The Pacific coast population of the western snowy plover (Charadrius alexandrinus nivosus) is federally listed as threatened. The current Pacific coast breeding population extends from Damon Point, Washington, to Bahia Magdalena, Baja California, Mexico. The snowy plover winters mainly in coastal areas from southern Washington to Central America. HABITAT REQUIREMENTS AND LIMITING FACTORS: The Pacific coast population of western snowy plovers breeds primarily above the high tide line on coastal beaches, sand spits, dune-backed beaches, sparsely-vegetated dunes, beaches at creek and river mouths, and salt pans at lagoons and estuaries. Less common nesting habitats include bluff-backed beaches, dredged material disposal sites, salt pond levees, dry salt ponds, and river bars. In winter, snowy plovers are found on many of the beaches used for nesting as well as on beaches where they do not nest, in man-made salt ponds, and on estuarine sand and mud flats. Habitat degradation caused by human disturbance, urban development, introduced beachgrass (Ammophila spp.), and expanding predator populations have resulted in a decline in active nesting areas and in the size of the breeding and wintering populations. RECOVERY OBJECTIVE: The primary objective of this recovery plan is to remove the Pacific coast western snowy plover population from the List of Endangered and Threatened Wildlife and Plants by: (1) achieving well- distributed increases in numbers and productivity of breeding adult birds, and (2) providing for long-term protection of breeding and wintering plovers and their habitat. RECOVERY PRIORITY: 3C, per criteria published by Federal Register Notice (48 FR 43098; September 12, 1983). v RECOVERY CRITERIA: The Pacific coast population of the western snowy plover will be considered for delisting when the following criteria have been met: 1. Maintain for 10 years an average of 3,000 breeding adults distributed among 6 recovery units as follows: Washington and Oregon, 250 breeding adults; Del Norte to Mendocino Counties, California, 150 breeding adults; San Francisco Bay, California, 500 breeding adults; Sonoma to Monterey Counties, 400 breeding adults; San Luis Obispo to Ventura Counties, California, 1,200 breeding adults; and Los Angeles to San Diego Counties, California, 500 breeding adults. 2. Maintain a 5-year average productivity of at least 1.0 fledged chick per male in each recovery unit in the last 5 years prior to delisting. 3. Have in place participation plans among cooperating agencies, landowners, and conservation organizations to assure protection and management of breeding, wintering, and migration areas listed in Appendix B to maintain the subpopulation sizes and average productivity specified in criteria 1 and 2 above. ACTIONS NEEDED: 1. Monitor and manage breeding habitat of the Pacific coast population of the western snowy plover to maximize survival and productivity. 2. Monitor and manage wintering and migration areas to maximize snowy plover population survival. 3. Develop mechanisms for long-term management and protection of snowy plovers and their breeding and wintering habitat. 4. Undertake scientific investigations that facilitate recovery efforts. 5. Undertake public information and education programs. 6. Review progress towards recovery annually and revise recovery efforts as appropriate. vi 7. Dedicate U.S. Fish and Wildlife Service staff and funding for the Sacramento Fish and Wildlife Office to coordinate recovery implementation. 8. Establish an international conservation program with the government of Mexico to protect snowy plovers and their breeding and wintering locations in Mexico. Appendix J addresses Actions 1 and 2, providing guidelines for monitoring snowy plovers during the breeding and wintering seasons. Appendix K addresses Action 5, providing a public information and education plan. ESTIMATED COST OF RECOVERY: $28,588,000 plus additional costs that cannot be estimated at this time. DATE OF RECOVERY: Delisting could occur by 2025 if recovery criteria have been met. vii TABLE OF CONTENTS I. INTRODUCTION ...............................................1 A. DESCRIPTION AND TAXONOMY .........................4 B. LIFE HISTORY AND ECOLOGY ...........................6 1. Breeding ..........................................6 a. Population Size and Distribution .................7 b. Arrival and Courtship..........................8 c. Duration of Breeding Season ....................9 d. Nests and Nest Sites...........................9 e. Egg Laying, Clutch Size, and Incubation ..........10 f. Clutch Hatching Success .......................12 g. Brood-rearing ...............................12 h. Fledging Success .............................13 i. Productivity .................................13 j. Survival ....................................14 2. Feeding Habitat and Habits...........................15